title: CD4 T cells guarantee optimal competitive fitness of CD8 memory T cells.
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D007156:Immunologic Memory / Q000276:immunology*; D051379:Mice